Turntable-braking means



Nov. 27, 1923 M. WEIL.

TURNTABLE BRAKING MEANS Original" Filed April 5 3 j y fiegzmntoz sen,aumw,

Patented Nov. 27, 1923.

UNITED STAS PATET )MAXIMILIAN WEIL, OF NEW YORK, N.

Y., ASSIGNOR '10 SPHINX GRAMOPH N MOTORS, INC., OF NEW YORK, N. Y., ACORPORATION OF NEW YORK,

TURNTABLE-BRAKING MEANS.

Application filed April 3, 1919, Serial No. 287,238. Renewed October 23,1923.

To all whom z'zimayconcern:-

Be it known that I, MAXIMILIAN IVEIL, a citizen of the United States ofAmerica, residing at borough of Manhattan, city, county, and State ofNew York, have invented certain new and useful Improvements inTurntable-Braking Means, of which'the following is a specification.

This invention relates to turn tables for motors and means for brakingthe same.

An object of the invention is to provide a turn table of a phonograph,or like device, with improved braking means for gradually retarding thespeed and arranged to materially reduce the stresses and strains towhich'the parts of the turn table and the parts of the motor aresubjected. A

' further object of the invention is to arrange the braking means in animproved relation relative to the turn table whereby the extent of wearof the engaging parts is reduced. V r

In accordance with the most preferred forms of my invention, the turntable is provided with abutment means coacting with a yieldableretarding element, the same being arranged and constructed forretardation gradually until the turn table is brought to rest.

Further features and objects of the invention will be more fullyunderstood from the following description and the accompanying drawings,in which' Fig. 1 is a top plan view of a turn table of a phonograph,with the upper surface partly broken away;

Fig. 2 is a section on line 2-2 of Fig. 1, as viewed in the direction ofthe indicating arrows; and

Fig. 3 is a front elevation of the brake stop.

In the drawings I have indicated a form of my invention applicable forbraking the turn table of phonograph, although as is apparent theinvention is applicable to other types of turn tables and other devicesadapted to be braked.

The turn table 1 is mounted on the shaft 2, of usual construction as bymeans of the usual recessed lug 3. The shaft 2 is driven by a springwound motor, an electric motor or other suitable actuating means,preferably provided with a speed regulator.

The gradually retarding'means comprises one or more members ofpredetermined periphery, coacting with a yieldably mounted retardingmeans, including a spring or other yieldable, and preferably resilientlyyieldable, element. In the embodiment of the invention shown in thedrawings, I have indicated three members of predetermined contour,designated respectively 4, 5, 6, each formed of a strip of metaldisposed on and carried by the inner side of; the rim 7 of the turntable. The attachment of each member 4, 5, 6 to the inner rim 7 may beperformed by soldering, or by riveting or other approved means. As showneach member 4, 5, 6 is of a graduated curved contour and may, as shown,be disposed about the inner face of the rim '7 to extend around theentire circumference of the inner face of the rim 7.

The yieldably mounted retarding means comprises the arm 8 provided witha braking face of leather 9 or similar friction material, said arm 8being pivoted on the pin 10 extending from the plate 11 mounted by meansof the screws 12 on a suitable support. The arm 8 is controlled by meansof the finger 13, for manual control,- or by any of various equivalentmeans of familiar type automatically or manually actuated. The arm 8 isprovided withthe eccentriclally mounted spring 14, shown having its oneend fixed on the pin 15 car ried by the base 11 and its oppositeendsecured to the pin 16 disposed on the arm 8 eccentrically relativetot-he center of the pivot 10. I

Accordingly, upon manually or otherwise tripping the arm 8 the brakefacing of leather 9 is brought into engagement with the effective faceofthe retarding members 4, 5, 6 thereby providing an undulating face ofengagement for the facing 9. At the instant of contact of the facing 9with any member 4, 5, 6, as for example, at the position shown in Fig.1, assuming the turn table to have been rotated. in the direction of thearrow 17, the continued rotation of the turn table 1, by reason of thetrough 18 opposite the member 6, effects a movement of the arm 8 moreclosely toward the inner periphery of the rim 7, thereby lessening theeffective lever arm: of the force applied by the spring 14 to-the arm 8and accordingly applying to the facing 9 a force insufficient toinstantly brake the turn table, but of suficient force to'graduallyretard the turn table. Upon the continued rotation of the turn tablewhen in the direction of the arrow 17 past the point 18, see Fig. 1, thefacing 9 rides on the up curve of the member 5, during which.- stage anin-' creasing degree of retardation is exerted, and after passing thecrest of the member 5, the. degree of retardation is decreased until theretarding member 6 is: reached and a similar graduated retardation iseffected.

In ope-ration, my apparatus thus exerts its maximum braking force onlyat intervals, the braking force being applied continuously in thepreferred embodiment and alternately increasing to and decreasing fromthe maximum value. It will also be seen that the maximum braking forceis applied during longer periods as the turn table slows down until themotor is brought to a full stop. My braking apparatus thus eliminatesthe harmful strains upon the spring motor which may result from bringingthe turntable to an abrupt stop.

Preferably, each retarding member a, 5, 6 is an arc of a cricle and inthe specific instance shown, the center of the member 4 is located atthe point 21, the center of the member 5 is located at the point 19 andthe center of the member 6 is located at the point 20.

The invention is applicable similarly for phonograph turn tables of thetype of externally engaging braking members; however, the. type ofinternally engaging braking members as shown in the drawing, isadvantageous by reason of its concealment and by reason of the absenceof dissynnnetrical parts and embodies features of simple assembly.

It will be noted that the invention comprises, in coaction with theyieldable braking stop, means of varying diameter or other variablecontour adapted to gradually brake the turn table by the application ofvariable brakingforce, tending to gradually retard the turn table andthe gearing or other actuating means.

Whereas I have described my invention by reference to specific formsthereof, it will be understood that many changes and modifications maybe made without departing from the spirit of the invention as defined bythe appended claims.

I claim;

1. In a phonograph, the combination with the turn table, of brakingmeans for said turn table, comprising a member ofvarying contourcontrolled by said turn table, a yielding element normally maintainedout of engagement with the rotating parts adapted when in brakingposition to engage said member of varying contour, and means forsupporting said yielding element.

periphery and a yieldingly mounted element adapted when in brakingposition to engage said eccentric conformation but maintained innon-braking position during operative rotation of the turn table.

4. The combination with a rotatable turn table of a phonograph having acircular periphery, of braking means therefor, com prising a pluralityof serially arranged members disposed eccentrically relative to saidcircular periphery, a yieldable arm adapted to engage saideccentric-ally disposed members and means for moving said arm into andout of braking position.

5. The combination with a rotatable phonograph turn table including arim having an inner circular periphery, of braking means comprising aplurality of members disposed within said rim and eccentrically relativeto said circular periphery, an arm, means for pivoting said arm andmeans for resiliently controlling said arm.

6. In a phonograph, the combination with the turn table, of brakingmeans for said turn table comprising a member of varying diametercontrolling said turn table and a stop adapted when in braking positionto engage said member of varying diameter and held in non-brakingposition during operative rotation of the turn table.

7. The combination with a rotatable, circular turn table of aphonograph, of braking means therefor comprising an element of varyingdiameter carried by said circular turn table, a yielding stop and meansfor moving said stop at will into engagement with said member of varyingdiameter.

8. The method of bringing a phonograph spring motor to a full stopwhich. consists in applying at intervals a braking force of apredetermined. magnitude.

9. The method of bringing a phonograph. spring motor to a full stopwhich consists in braking the turntabl shaft with a gradually varyingforce alternately increasing in magnitude to and decreasing from adefinite maximum value.

10. The method of bringing a phonograph spring motor to a full stopwhich consists in applying at intervals a braking force, of apredetermined magnitude, and of a duration increasing as the motor isremaximum value, While lengthening the petarded. riod during Which themaximum braking 11. The method of stopping the operation force isapplied as the turn table is retarded 10 of a phonograph spring motorwhich confrom operative running speed to full stop. 5 sists in brakingthe turn table With a gradu- In testimony whereof I have signed thisally varying force alternately increasing in specification this 21st dayof March 1919. magnitude to and decreasing from a definite MAXIMILIANWEIL.

